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The Moon's Ancient Magnetism

The moon is now a dead body, but it seems once to have generated its own magnetic field. Since then it has been shifted with respect to its spin axis-perhaps by collisions with moon-orbiting satellites

By S. K. Runcorn

The Fracturing of Glass

Only recently have the atomic interactions underlying glass fracture been defined. The work suggests ways to slow or even stop the growth of cracks in glass and other brittle materials

By Terry A. Michalske and Bruce C. Bunker

Technology in Services

Service industries can be very technology-intensive. They can stabilize U.S. employment, make U.S. manufacturing industries more competitive and support an ever higher standard of living

By James Brian Quinn, Jordan J. Baruch and Penny Cushman Paquette

How Animal Cells Move

They do so by bringing pieces of the outer membrane into the cytoplasm and then recycling them to the surface in a directed way. Nutrients are brought into the cell by the same process

By Mark S. Bretscher

H.M.S. Warrior

Recently restored after suffering more than a century of neglect, the vessel was the first iron-hulled, armored warship. It deterred the enemy as it sealed its fate by engendering a naval arms race

By Walter Brownlee

Cosmic Strings

Why are stars and galaxies clumped rather than spread out evenly in space? What drew them together? Thin strings of energy created during the birth of the universe may have provided the attraction

By Alexander Vilenkin

Collective Computation in Neuronlike Circuits

Electronic circuits based on neurobiological models are able to solve complex problems rapidly. Their computational properties emerge {rom the collective interaction of many parts linked together in a network

By David W. Tank and John J. Hopfield

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